[FS#536] uci -m import duplicates list entries on repeated imports

[LEDE Bugs]

The following task has a new comment added:

FS#536 - uci -m import  duplicates list entries on repeated imports 
User who did this - Martin Tippmann (glycoknob)

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Related: https://lists.openwrt.org/pipermail/openwrt-devel/2016-April/040817.html 
https://lists.openwrt.org/pipermail/openwrt-devel/2016-April/040833.html
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=536#comment1881